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Local and nonlocal isomer shifts in bcc Fe-{ital X} alloys ({ital X}=Al,Si,Ga,Ge)

Journal Article · · Physical Review, B: Condensed Matter
;  [1];  [2];  [3]
  1. California Institute of Technology, Pasadena, California 91125 (United States)
  2. Department of Physics, Wichita State University, Wichita, Kansas 67260 (United States)
  3. Center for Electromagnetics Research, Northeastern University, Boston, Massachusetts 02115 (United States)
+ Show Author Affiliations
We measured Moessbauer spectra from bcc alloys of compositions near Fe{sub 3}Al, Fe{sub 3}Si, and Fe{sub 3}Ge, and reanalyzed older data from Fe{sub 3}Ga. All four alloys developed some {ital D}0{sub 3} chemical order, and their Moessbauer spectra were qualitatively similar. The local (first-nearest-neighbor) could be distinguished from the nonlocal (beyond the first-nearest-neighbor) contributions to the {sup 57}Fe isomer shifts from the solute atoms owing to differences in their hyperfine magnetic fields. The nonlocal isomer shift contributions correlated best to the valence of the solute atom, and not to the atomic volume. The local isomer shift contributions were best attributed to a loss of Fe 3{ital d} electrons at the solute sites.
DOE Contract Number:
FG03-86ER45270
OSTI ID:
142599
Journal Information:
Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 49; ISSN 0163-1829; ISSN PRBMDO
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BCC LATTICES
BINARY ALLOY SYSTEMS
GALLIUM ALLOYS
GERMANIUM ALLOYS
IRON BASE ALLOYS
ISOMER SHIFT
MOESSBAUER EFFECT
SILICON ALLOYS